AMKR·Amkor Technology Inc.

Realized volatility (21d)

57.5% 72nd pct

Below its peak

-47.2%

vs 200-day average

-14.9%

Up days (1y)

50%

Amkor Technology Inc. is currently running 57.5% annualised volatility over the last 21 sessions. Measured against AMKR's own 13 years of daily returns rather than a market-wide average, that is the 72nd percentile — a little above its own norm, against a typical reading of 44.9%. The distinction matters because a number that looks calm for one stock is turbulent for another, and the absolute figure on its own tells you neither.

AMKR is trading -47.2% below its running peak. Across 12 full years on file, its median worst-drawdown-in-a-year was -44.3%, and the deepest was -58.2% in 2015. The current drawdown is already deeper than this stock's typical annual low point, which puts it in the part of its range where past recoveries began — and where past declines also continued.

Price sits -14.9% from its 200-day moving average. Against every other day in its history, that gap ranks at the 19th percentile — a narrower gap than it typically runs. Over the past year AMKR closed higher on 50% of sessions, and it is currently 5 sessions into a falling streak.

On October specifically: over 13 years of records, AMKR finished the month higher 7 of 13 times, with a median return of +4.0% and an average of +6.2%. Its strongest month historically has been November at +7.5% on average, its weakest September at -2.6%. Seasonality is a weak signal on its own — a decade is a small sample and regimes change — but it is a real distribution rather than a rule of thumb.

Overnight risk is measurable too: AMKR has opened more than 2% away from the prior close in 411 of 3,266 sessions (12.6% of the time), with the largest gaps running +15.6% and -14.3%. For anyone holding through an event, that rate is a better guide to overnight exposure than the intraday range.

All figures computed from 3,267 daily closes between 2013-10-14 and 2026-10-09, split-adjusted, recomputed daily. Percentiles are against AMKR's own 13-year history, not a peer group or index.